*{
    padding: 0;
    margin: 0;
    list-style: none;
}
#app{
    width: 100%;
    height: 100%;
}
header{
    width: 100%;
    height: 50px;
    float: left;
}
ul{
    margin-left: 200px;
}
ul li{
    float: left;
    margin-left: 50px;
    line-height: 50px;
}
main{
    width: 80%;
    height: 500px;
    display: flex;
}
.left{
    width: 500px;
    height: 100%;
}
ol{
    margin-left: 200px;
}
ol li{
    margin-top: 8px;
}
ol li span{
    float: right;
    margin-right: 10px;
}
.right{
    width: 1500px;
    height: 100%;
}
.bottom{
    width: 87%;
    height: 350px;
}
.bottom ul{
    display: flex;
    margin-left: 200px;
}
.bottom{
    margin-left: 200px;
}
.bottom img{
    width: 200px;
    height: 200px;
    margin-left: 50px;
}
.img1{
    width: 100%;
    height: 250px;
}
.img2{
    width: 100%;
    height: 250px;
}
.image1{
    width: 700px;
    height: 240px;
}
.image2{
    width: 200px;
    height: 240px;
}
.image3{
    width: 300px;
    height: 240px;
}
.image4{
    width: 300px;
    height: 240px;
}
.image5{
    width: 200px;
    height: 240px;
}